Claude Haiku 4.5 vs Gemini 3.8 Flash

Gemini 3.8 Flash leads Claude Haiku 4.5 on coding, 61.6 to 35.6 on the Vibe Coding Index, and Gemini 3.8 Flash costs 1.3x less per output token ($3.75 vs $5.00 per million). Updated October 22, 2026; 80 benchmarks have a result for both.

Replace Claude Haiku 4.5 Replace Gemini 3.8 Flash

Claude Haiku 4.5Anthropic

Coding: 35.6
Overall: 41.0
Output $/M: $5.00

Gemini 3.8 FlashGoogle

Coding: 61.6
Overall: 69.0
Output $/M: $3.75

vs boards won of 80 shared

Claude Haiku 4.5 or Gemini 3.8 Flash: which to pick

Pick Gemini 3.8 Flash for coding: it scores 61.6 on the Vibe Coding Index against 35.6 for Claude Haiku 4.5.

Pick Claude Haiku 4.5 for a lower cost per solved task ($0.56 against $2.74) and work measured by LiveBench data analysis or MedScribe (Vals AI), where it leads.

Model AClaude Haiku 4.5Anthropic35.6/1004 independent benchmarks$0.56 per solved task Model BGemini 3.8 FlashGoogle61.6/1006 independent benchmarks$2.74 per solved task

801548

Shared results: 80
Claude Haiku 4.5 only: 15
Gemini 3.8 Flash only: 48
Like-for-like categories: 8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

Coding
Vibe Coding Index, six public coding benchmarks
Gemini 3.8 Flash
Gemini 3.8 Flash scores 61.6 against 35.6.
4 and 6 benchmarks behind the scores
Intelligence
AA Intelligence Index
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 40.9 against 16.9.
Same board, both measured
Agentic work
AA Agentic Index
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 40.2 against 8.0.
Same board, both measured
Reasoning
GPQA Diamond
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 94.4% against 72.2%.
Same board, both measured
Math
AIME
No call
Only Claude Haiku 4.5 has a AIME result, 82.7%.
Directional only
Knowledge
MMLU Pro
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 90.2% against 78.7%.
Same board, both measured
Web design
Design Arena: websites
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 1300 against 1122.
Same board, both measured
General
Vals Index
No call
Only Gemini 3.8 Flash has a Vals Index result, 56.0%.
Directional only
Long documents
Listed context window
Gemini 3.8 Flash
Gemini 3.8 Flash takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.8 Flash
Claude Haiku 4.5 $0.0035, Gemini 3.8 Flash $0.0026 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Claude Haiku 4.5
Claude Haiku 4.5 $0.56, Gemini 3.8 Flash $2.74.
Published attempt cost and pass rate

At a glance

Coding index: Claude Haiku 4.5 35.6 from 4 benchmarks, Gemini 3.8 Flash 61.6 from 6 benchmarks.
Widest category: Reasoning, 34.3 points apart on average over 10 shared benchmarks.
Widest single gap: ARC-AGI-2: Claude Haiku 4.5 4.0% against Gemini 3.8 Flash 89.2%, 85.1 points apart on a 0 to 100 scale.
Output price: Claude Haiku 4.5 $5.00 against Gemini 3.8 Flash $3.75 per million output tokens, 1.3x apart.
Context window: Claude Haiku 4.5 takes 200K tokens, Gemini 3.8 Flash 1.05M.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
Category	Claude Haiku 4.5	Gemini 3.8 Flash
Coding	0	14
Intelligence	0	2
Agentic work	0	9
Reasoning	0	10
Math	0	3
Knowledge	0	10
Web design	0	9
General	2	21
All shared boards	2	78

CodingLike-for-likeSix of these boards feed the Vibe Coding Index014

Coding benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
SWE-bench Verified	66.6%	Not measured	Only Claude Haiku 4.5 measured
SWE-bench Multilingual	64.7%	Not measured	Only Claude Haiku 4.5 measured
LiveBench coding	48.1%	82.2%	Gemini 3.8 Flash
LMArena WebDev	1330	1585	Gemini 3.8 Flash
AA Coding Index	43.9	76.3	Gemini 3.8 Flash
LiveCodeBench (Vals AI)	41.2%	89.5%	Gemini 3.8 Flash
SWE-bench Verified (Vals AI)	66.6%	80.0%	Gemini 3.8 Flash
Terminal-Bench 4 (Vals AI)	Not measured	19.7%	Only Gemini 3.8 Flash measured
Vibe Code Bench (Vals AI)	11.4%	78.7%	Gemini 3.8 Flash
Code migration (Vals AI)	7.5%	36.5%	Gemini 3.8 Flash
ProgramBench (Vals AI)	0.0%	1.0%	Gemini 3.8 Flash
IOI (Vals AI)	Not measured	56.9%	Only Gemini 3.8 Flash measured
Terminal-Bench 2.1 (Vals AI)	43.8%	81.3%	Gemini 3.8 Flash
SWE-bench Multimodal (Vals AI)	Not measured	40.8%	Only Gemini 3.8 Flash measured
Vibe Code Bench 1-100 (Vals AI)	Not measured	18.8%	Only Gemini 3.8 Flash measured
SkillsBench (Vals AI)	Not measured	58.0%	Only Gemini 3.8 Flash measured
CyberBench (Vals AI)	Not measured	43.8%	Only Gemini 3.8 Flash measured
SciCode	Not measured	56.6%	Only Gemini 3.8 Flash measured
Terminal-Bench	35.5%	Not measured	Only Claude Haiku 4.5 measured
FrontierCode	Not measured	41.2%	Only Gemini 3.8 Flash measured
FrontierSWE	Not measured	19.6%	Only Gemini 3.8 Flash measured
WeirdML	45.4%	84.8%	Gemini 3.8 Flash
ALE-Bench	Not measured	1269.7	Only Gemini 3.8 Flash measured
LMArena Text: coding	1454	1508	Gemini 3.8 Flash
LMArena Text: software and IT	1439	1507	Gemini 3.8 Flash
LMArena WebDev: React	1326	1577	Gemini 3.8 Flash
LMArena WebDev: HTML	1318	1616	Gemini 3.8 Flash
LMArena WebDev: from an image	Not measured	1593	Only Gemini 3.8 Flash measured
SciCode	Not measured	12.3%	Only Gemini 3.8 Flash measured
Neither model has a result on the other 10 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02

Intelligence benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
AA Intelligence Index	16.9	40.9	Gemini 3.8 Flash
Epoch Capabilities Index	142.2	157.4	Gemini 3.8 Flash

Agentic workLike-for-likePublic boards, shown as published, kept out of the index09

Agentic work benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
AA Agentic Index	8.0	40.2	Gemini 3.8 Flash
Design Arena: agents building web apps	Not measured	1238	Only Gemini 3.8 Flash measured
Design Arena: agents building full-stack apps	Not measured	1244	Only Gemini 3.8 Flash measured
Design Arena: agents building mobile apps	Not measured	1236	Only Gemini 3.8 Flash measured
Design Arena: agents building Android apps	Not measured	1078	Only Gemini 3.8 Flash measured
Design Arena: agents building Godot games	Not measured	1273	Only Gemini 3.8 Flash measured
Design Arena: PowerPoint slides	Not measured	1153	Only Gemini 3.8 Flash measured
Design Arena: spreadsheets	Not measured	1022	Only Gemini 3.8 Flash measured
LiveBench research	42.2%	79.1%	Gemini 3.8 Flash
LiveBench browser	40.0%	64.0%	Gemini 3.8 Flash
LiveBench long agentic	11.1%	30.1%	Gemini 3.8 Flash
SREBench (Vals AI)	Not measured	11.1%	Only Gemini 3.8 Flash measured
Finance Agent (Vals AI)	31.0%	61.4%	Gemini 3.8 Flash
Tax Agent Bench (Vals AI)	5.9%	32.1%	Gemini 3.8 Flash
Legal Research Bench (Vals AI)	10.6%	38.9%	Gemini 3.8 Flash
Harvey's Legal Agent Benchmark (Vals AI)	Not measured	12.1%	Only Gemini 3.8 Flash measured
Excel Modeling Benchmark (Vals AI)	22.7%	72.2%	Gemini 3.8 Flash
BioMysteryBench (Vals AI)	Not measured	62.2%	Only Gemini 3.8 Flash measured
Terminal-Bench-Science (Vals AI)	Not measured	8.6%	Only Gemini 3.8 Flash measured
Vals Science Index	Not measured	35.8%	Only Gemini 3.8 Flash measured
Time Horizon Index (Vals AI)	Not measured	18.8%	Only Gemini 3.8 Flash measured
CUA-bench (Vals AI)	Not measured	4.2%	Only Gemini 3.8 Flash measured
APEX-Agents	Not measured	64.3%	Only Gemini 3.8 Flash measured
Remote Labor Index	Not measured	5.8%	Only Gemini 3.8 Flash measured
BALROG	31.2%	Not measured	Only Claude Haiku 4.5 measured
DeepResearch Bench	45.5%	Not measured	Only Claude Haiku 4.5 measured
Vending-Bench 2	$459	$5,094	Gemini 3.8 Flash
Berkeley Function Calling Leaderboard (BFCL)	68.7%	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 13 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index010

Reasoning benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
GPQA Diamond	72.2%	94.4%	Gemini 3.8 Flash
LiveBench reasoning	61.7%	89.3%	Gemini 3.8 Flash
MysteryMechanism (Vals AI)	Not measured	36.5%	Only Gemini 3.8 Flash measured
MMMU Pro (Vals AI)	46.1%	89.1%	Gemini 3.8 Flash
GPQA Diamond (Artificial Analysis run)	Not measured	95.3%	Only Gemini 3.8 Flash measured
Humanity's Last Exam (Artificial Analysis run)	Not measured	47.8%	Only Gemini 3.8 Flash measured
GPQA Diamond (Epoch AI run)	71.2%	95.4%	Gemini 3.8 Flash
ARC-AGI	47.7%	98.5%	Gemini 3.8 Flash
ARC-AGI-2	4.0%	89.2%	Gemini 3.8 Flash
Chess puzzles	8.0%	58.0%	Gemini 3.8 Flash
Mystery game puzzles	Not measured	47.0%	Only Gemini 3.8 Flash measured
LMArena Text: hard prompts	1421	1509	Gemini 3.8 Flash
LMArena Text: expert	1443	1526	Gemini 3.8 Flash
LMArena Text: hard prompts in English	1435	1504	Gemini 3.8 Flash
LMArena Vision: diagrams	Not measured	1345	Only Gemini 3.8 Flash measured
LMArena Vision: homework	Not measured	1351	Only Gemini 3.8 Flash measured
Neither model has a result on the other 6 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index03

Math benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
AIME	82.7%	Not measured	Only Claude Haiku 4.5 measured
MGSM (Vals AI)	92.2%	Not measured	Only Claude Haiku 4.5 measured
OTIS Mock AIME	66.7%	98.9%	Gemini 3.8 Flash
FrontierMath, tiers 1 to 3	Not measured	68.4%	Only Gemini 3.8 Flash measured
FrontierMath, tier 4	Not measured	22.0%	Only Gemini 3.8 Flash measured
ProofBench	Not measured	48.0%	Only Gemini 3.8 Flash measured
MATH level 5	96.4%	Not measured	Only Claude Haiku 4.5 measured
LMArena Text: math	1398	1532	Gemini 3.8 Flash
LMArena Text: mathematical work	1430	1519	Gemini 3.8 Flash
Neither model has a result on the other 4 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index010

Knowledge benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
MMLU Pro	78.7%	90.2%	Gemini 3.8 Flash
LegalBench (Vals AI)	81.2%	87.0%	Gemini 3.8 Flash
CaseLaw (Vals AI)	56.5%	Not measured	Only Claude Haiku 4.5 measured
CorpFin (Vals AI)	60.6%	Not measured	Only Claude Haiku 4.5 measured
TaxEval (Vals AI)	67.5%	74.5%	Gemini 3.8 Flash
MortgageTax (Vals AI)	62.2%	65.3%	Gemini 3.8 Flash
MedQA (Vals AI)	79.6%	Not measured	Only Claude Haiku 4.5 measured
MedCode (Vals AI)	32.7%	48.1%	Gemini 3.8 Flash
SimpleQA Verified	13.2%	69.7%	Gemini 3.8 Flash
LMArena Text: science	1406	1523	Gemini 3.8 Flash
LMArena Text: medicine and healthcare	1394	1508	Gemini 3.8 Flash
LMArena Text: legal and government	1400	1497	Gemini 3.8 Flash
LMArena Text: business and finance	1400	1479	Gemini 3.8 Flash
FACTS Benchmark Suite	Not measured	69.4%	Only Gemini 3.8 Flash measured
Neither model has a result on the other 4 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index09

Web design benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
Design Arena: websites	1122	1300	Gemini 3.8 Flash
Design Arena: UI components	1097	1316	Gemini 3.8 Flash
Design Arena: game dev	1097	1304	Gemini 3.8 Flash
Design Arena: data viz	1124	1270	Gemini 3.8 Flash
Design Arena: 3D	1071	1294	Gemini 3.8 Flash
Design Arena: all code categories	1114	1303	Gemini 3.8 Flash
Design Arena: SVG	1025	1296	Gemini 3.8 Flash
Design Arena: ASCII art	1140	1262	Gemini 3.8 Flash
LiveBench design	59.9%	72.7%	Gemini 3.8 Flash

GeneralLike-for-likePublic boards, shown as published, kept out of the index221

General benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
Vals Index	Not measured	56.0%	Only Gemini 3.8 Flash measured
LiveBench data analysis	59.3%	54.0%	Claude Haiku 4.5
Public Benefits Bench (Vals AI)	54.3%	65.3%	Gemini 3.8 Flash
SAGE (Vals AI)	31.8%	35.1%	Gemini 3.8 Flash
MedScribe (Vals AI)	85.2%	84.5%	Claude Haiku 4.5
Vals Multimodal Index	42.9%	Not measured	Only Claude Haiku 4.5 measured
Long context reasoning (AA-LCR)	Not measured	84.0%	Only Gemini 3.8 Flash measured
DTBench	73.6%	95.7%	Gemini 3.8 Flash
LMCA	30.9%	52.9%	Gemini 3.8 Flash
Surface Evolver Bench	Not measured	76.9%	Only Gemini 3.8 Flash measured
Furniture assembly	Not measured	31.7%	Only Gemini 3.8 Flash measured
ExploitBench	13.7%	Not measured	Only Claude Haiku 4.5 measured
LMArena Text	1397	1499	Gemini 3.8 Flash
LMArena Text: instruction following	1414	1492	Gemini 3.8 Flash
LMArena Text: creative writing	1371	1488	Gemini 3.8 Flash
LMArena Vision	Not measured	1315	Only Gemini 3.8 Flash measured
LMArena Text: English	1414	1498	Gemini 3.8 Flash
LMArena Text: non-English	1377	1491	Gemini 3.8 Flash
LMArena Text: Chinese	1418	1553	Gemini 3.8 Flash
LMArena Text: German	1374	1501	Gemini 3.8 Flash
LMArena Text: Japanese	1338	1507	Gemini 3.8 Flash
LMArena Text: Korean	1346	1464	Gemini 3.8 Flash
LMArena Text: French	1411	1496	Gemini 3.8 Flash
LMArena Text: Spanish	1421	1487	Gemini 3.8 Flash
LMArena Text: Russian	1381	1514	Gemini 3.8 Flash
LMArena Text: Polish	1343	1497	Gemini 3.8 Flash
LMArena Text: multi-turn	1409	1503	Gemini 3.8 Flash
LMArena Text: longer queries	1427	1507	Gemini 3.8 Flash
LMArena Text: writing and language	1386	1494	Gemini 3.8 Flash
LMArena Text: entertainment and media	1369	1480	Gemini 3.8 Flash
LMArena Vision: English	Not measured	1318	Only Gemini 3.8 Flash measured
LMArena Vision: Chinese	Not measured	1416	Only Gemini 3.8 Flash measured
LMArena Vision: reading text	Not measured	1333	Only Gemini 3.8 Flash measured
LMArena Vision: humor	Not measured	1321	Only Gemini 3.8 Flash measured
LMArena Vision: creative writing	Not measured	1299	Only Gemini 3.8 Flash measured
LMArena Document	1420	Not measured	Only Claude Haiku 4.5 measured
Neither model has a result on the other 10 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Claude Haiku 4.5 and Gemini 3.8 Flash
Benchmark	Claude Haiku 4.5	Gemini 3.8 Flash	Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Haiku 4.5$0.0035Fits in one request

Gemini 3.8 Flash$0.0026Fits in one request

Gemini 3.8 Flash costs less

Repository review

50K input + 3K output tokens

Claude Haiku 4.5$0.065Fits in one request

Gemini 3.8 Flash$0.049Fits in one request

Gemini 3.8 Flash costs less

Agent loop

200K input + 10K output tokens

Claude Haiku 4.5$0.250Exceeds the context window

Gemini 3.8 Flash$0.188Fits in one request

Gemini 3.8 Flash costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Haiku 4.5 and Gemini 3.8 Flash
Specification	Anthropic Claude Haiku 4.5	Google Gemini 3.8 Flash
Maker	Anthropic	Google
Weights	No public weights listed	No public weights listed
Released	October 15, 2025	September 2, 2026
Context window	200K	1.05M
Input $/Mtok	$1.00	$0.75
Output $/Mtok	$5.00	$3.75
Coding index	35.6	61.6
Independent measurements behind it	4	6
Cost per solved task	$0.56	$2.74
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Haiku 4.5 better than Gemini 3.8 Flash for coding?

Pick Gemini 3.8 Flash for coding: it scores 61.6 on the Vibe Coding Index against 35.6 for Claude Haiku 4.5. Pick Claude Haiku 4.5 for a lower cost per solved task ($0.56 against $2.74) and work measured by LiveBench data analysis or MedScribe (Vals AI), where it leads.

Which is cheaper, Claude Haiku 4.5 or Gemini 3.8 Flash?

Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Gemini 3.8 Flash costs $0.75 and $3.75. Per solved SWE-bench Verified task, Claude Haiku 4.5 costs $0.56 and Gemini 3.8 Flash $2.74.

Which has the bigger context window, Claude Haiku 4.5 or Gemini 3.8 Flash?

Gemini 3.8 Flash, with 1.05M tokens against 200K.

How many benchmarks is the Claude Haiku 4.5 vs Gemini 3.8 Flash comparison based on?

80 benchmarks have a result for both models as of October 22, 2026. Claude Haiku 4.5's coding index rests on 4 independent benchmarks and Gemini 3.8 Flash's on 6. Where only one model has a result, the page says so instead of naming a winner.

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Claude Haiku 4.5 or Gemini 3.8 Flash: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

General

Long documents

Everyday cost

Cost per solved task

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

Compare next