Claude Haiku 4.5 vs Inkling 2 Small
Inkling 2 Small leads Claude Haiku 4.5 on coding, 48.9 to 31.4 on the Vibe Coding Index, and Inkling 2 Small costs 5.0x less per output token ($1.00 vs $5.00 per million). Updated November 14, 2026; 28 benchmarks have a result for both.
Claude Haiku 4.5 or Inkling 2 Small: which to pick
Pick Inkling 2 Small for coding: it scores 48.9 on the Vibe Coding Index against 31.4 for Claude Haiku 4.5.
Pick Claude Haiku 4.5 for work measured by LMArena Text: hard prompts in English or LMArena Text: instruction following, where it leads.
- Shared results
- 28
- Claude Haiku 4.5 only
- 64
- Inkling 2 Small only
- 23
- Like-for-like categories
- 6 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
Inkling 2 Small
Inkling 2 Small scores 48.9 against 31.4.
3 benchmarks behind each score
Intelligence
AA Intelligence Index
Inkling 2 Small
Inkling 2 Small leads, 30.6 against 7.4.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Claude Haiku 4.5 has a AA Agentic Index result, 8.0.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Haiku 4.5 has a GPQA Diamond result, 72.2%.
Directional only
Math
AIME
No call
Only Claude Haiku 4.5 has a AIME result, 82.7%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Haiku 4.5 has a MMLU Pro result, 78.7%.
Directional only
Web design
Design Arena: websites
No call
Only Claude Haiku 4.5 has a Design Arena: websites result, 1114.
Directional only
General
Vals Index
No call
Only Inkling 2 Small has a Vals Index result, 56.1%.
Directional only
Long documents
Listed context window
Inkling 2 Small
Inkling 2 Small takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Inkling 2 Small
Claude Haiku 4.5 $0.0035, Inkling 2 Small $0.0008 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Haiku 4.5 has the number, $0.56.
Directional only
At a glance
- Coding index
- Claude Haiku 4.5 31.4 from 3 benchmarks, Inkling 2 Small 48.9 from 3 benchmarks.
- Widest category
- Agentic work, 38.1 points apart on average over 3 shared benchmarks.
- Widest single gap
- ARC-AGI-2: Claude Haiku 4.5 4.0% against Inkling 2 Small 81.7%, 77.6 points apart on a 0 to 100 scale.
- Output price
- Claude Haiku 4.5 $5.00 against Inkling 2 Small $1.00 per million output tokens, 5.0x apart.
- Context window
- Claude Haiku 4.5 takes 200K tokens, Inkling 2 Small 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.
| Category | Claude Haiku 4.5 | Bars | Inkling 2 Small | Ties |
|---|---|---|---|---|
| Coding | 0 | 7 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 3 | ||
| Reasoning | 1 | 4 | ||
| Knowledge | 0 | 2 | ||
| General | 7 | 3 | ||
| All shared boards | 8 | 20 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index07
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | 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 |
| LMArena WebDev | 1330 | 1647 | Inkling 2 Small |
| AA Coding Index | 43.9 | Not measured | Only Claude Haiku 4.5 measured |
| LiveCodeBench (Vals AI) | 41.2% | Not measured | Only Claude Haiku 4.5 measured |
| SWE-bench Verified (Vals AI) | 66.6% | Not measured | Only Claude Haiku 4.5 measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 12.6% | Only Inkling 2 Small measured |
| Vibe Code Bench (Vals AI) | 11.4% | 81.5% | Inkling 2 Small |
| Code migration (Vals AI) | 7.5% | Not measured | Only Claude Haiku 4.5 measured |
| ProgramBench (Vals AI) | 0.0% | 0.5% | Inkling 2 Small |
| Terminal-Bench 2.1 (Vals AI) | 43.8% | Not measured | Only Claude Haiku 4.5 measured |
| SWE-bench Multimodal (Vals AI) | Not measured | 43.1% | Only Inkling 2 Small measured |
| CyberBench (Vals AI) | Not measured | 72.7% | Only Inkling 2 Small measured |
| SciCode | Not measured | 52.3% | Only Inkling 2 Small measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | Not measured | 13.1% | Only Inkling 2 Small measured |
| FrontierCode 2.0 | Not measured | 25.4% | Only Inkling 2 Small measured |
| Terminal-Bench | 35.5% | Not measured | Only Claude Haiku 4.5 measured |
| WeirdML | 45.4% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: coding | 1453 | 1455 | Inkling 2 Small |
| LMArena Text: software and IT | 1439 | 1443 | Inkling 2 Small |
| LMArena WebDev: React | 1326 | 1660 | Inkling 2 Small |
| LMArena WebDev: HTML | 1318 | 1661 | Inkling 2 Small |
| SWE-Bench Pro V2 | Not measured | 97.7% | Only Inkling 2 Small measured |
| Terminal-Bench 2.0 | 35.5% | Not measured | Only Claude Haiku 4.5 measured |
| ProgramBench | 0.0% | Not measured | Only Claude Haiku 4.5 measured |
| Neither model has a result on the other 27 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | Leader |
|---|---|---|---|
| AA Intelligence Index | 7.4 | 30.6 | Inkling 2 Small |
| Epoch Capabilities Index | 142.8 | Not measured | Only Claude Haiku 4.5 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | Leader |
|---|---|---|---|
| AA Agentic Index | 8.0 | Not measured | Only Claude Haiku 4.5 measured |
| SREBench (Vals AI) | Not measured | 1.9% | Only Inkling 2 Small measured |
| Finance Agent (Vals AI) | 31.0% | Not measured | Only Claude Haiku 4.5 measured |
| Tax Agent Bench (Vals AI) | 5.9% | 38.9% | Inkling 2 Small |
| Legal Research Bench (Vals AI) | 10.6% | 46.6% | Inkling 2 Small |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 21.7% | Only Inkling 2 Small measured |
| Excel Modeling Benchmark (Vals AI) | 22.7% | Not measured | Only Claude Haiku 4.5 measured |
| BioMysteryBench (Vals AI) | Not measured | 70.0% | Only Inkling 2 Small measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 2.9% | Only Inkling 2 Small measured |
| Vals Science Index | Not measured | 32.7% | Only Inkling 2 Small measured |
| APEX-Agents | Not measured | 46.8% | Only Inkling 2 Small 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 | Not measured | Only Claude Haiku 4.5 measured |
| Berkeley Function Calling Leaderboard (BFCL) | 68.7% | Not measured | Only Claude Haiku 4.5 measured |
| MCP Atlas | 40.2% | 85.4% | Inkling 2 Small |
| Neither model has a result on the other 28 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index14
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | Leader |
|---|---|---|---|
| GPQA Diamond | 72.2% | Not measured | Only Claude Haiku 4.5 measured |
| MysteryMechanism (Vals AI) | Not measured | 25.2% | Only Inkling 2 Small measured |
| MMMU Pro (Vals AI) | 46.1% | Not measured | Only Claude Haiku 4.5 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 44.1% | Only Inkling 2 Small measured |
| HLE-Diamond (Artificial Analysis run) | Not measured | 28.7% | Only Inkling 2 Small measured |
| CritPt v2, hard subset (Artificial Analysis run) | Not measured | 35.0% | Only Inkling 2 Small measured |
| GPQA Diamond (Epoch AI run) | 71.2% | Not measured | Only Claude Haiku 4.5 measured |
| ARC-AGI | 47.7% | 96.5% | Inkling 2 Small |
| ARC-AGI-2 | 4.0% | 81.7% | Inkling 2 Small |
| Chess puzzles | 8.0% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: hard prompts | 1420 | 1421 | Inkling 2 Small |
| LMArena Text: expert | 1443 | 1478 | Inkling 2 Small |
| LMArena Text: hard prompts in English | 1435 | 1424 | Claude Haiku 4.5 |
| Neither model has a result on the other 13 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | 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% | Not measured | Only Claude Haiku 4.5 measured |
| MATH level 5 | 96.4% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: math | 1397 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: mathematical work | 1429 | Not measured | Only Claude Haiku 4.5 measured |
| MathArena | Not measured | 42.4% | Only Inkling 2 Small measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | Leader |
|---|---|---|---|
| MMLU Pro | 78.7% | Not measured | Only Claude Haiku 4.5 measured |
| LegalBench (Vals AI) | 81.2% | Not measured | Only Claude Haiku 4.5 measured |
| 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% | Not measured | Only Claude Haiku 4.5 measured |
| MortgageTax (Vals AI) | 62.2% | Not measured | Only Claude Haiku 4.5 measured |
| MedQA (Vals AI) | 79.6% | Not measured | Only Claude Haiku 4.5 measured |
| MedCode (Vals AI) | 32.7% | Not measured | Only Claude Haiku 4.5 measured |
| AA-Omniscience | Not measured | 16.1 | Only Inkling 2 Small measured |
| SimpleQA Verified | 13.2% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: science | 1406 | 1409 | Inkling 2 Small |
| LMArena Text: medicine and healthcare | 1394 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: legal and government | 1400 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: business and finance | 1399 | 1415 | Inkling 2 Small |
| Neither model has a result on the other 7 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | Leader |
|---|---|---|---|
| Design Arena: websites | 1114 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: UI components | 1090 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: game dev | 1086 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: data viz | 1121 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: 3D | 1052 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: all code categories | 1104 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: SVG | 1015 | Not measured | Only Claude Haiku 4.5 measured |
| Design Arena: ASCII art | 1135 | Not measured | Only Claude Haiku 4.5 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index73
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | Leader |
|---|---|---|---|
| Vals Index | Not measured | 56.1% | Only Inkling 2 Small measured |
| Public Benefits Bench (Vals AI) | 54.3% | Not measured | Only Claude Haiku 4.5 measured |
| SAGE (Vals AI) | Not measured | 88.6% | Only Inkling 2 Small measured |
| MedScribe (Vals AI) | 85.2% | Not measured | Only Claude Haiku 4.5 measured |
| Vals Multimodal Index | 42.9% | Not measured | Only Claude Haiku 4.5 measured |
| Long context reasoning (AA-LCR) | Not measured | 83.3% | Only Inkling 2 Small measured |
| GDPval-AA | Not measured | 1630 | Only Inkling 2 Small measured |
| DTBench | 73.6% | Not measured | Only Claude Haiku 4.5 measured |
| LMCA | 30.9% | Not measured | Only Claude Haiku 4.5 measured |
| ExploitBench | 13.7% | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text | 1396 | 1403 | Inkling 2 Small |
| LMArena Text: instruction following | 1414 | 1408 | Claude Haiku 4.5 |
| LMArena Text: creative writing | 1371 | 1348 | Claude Haiku 4.5 |
| LMArena Text: English | 1414 | 1418 | Inkling 2 Small |
| LMArena Text: non-English | 1376 | 1390 | Inkling 2 Small |
| LMArena Text: Chinese | 1418 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: German | 1373 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: Japanese | 1340 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: Korean | 1344 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: French | 1411 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: Spanish | 1422 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: Russian | 1381 | 1377 | Claude Haiku 4.5 |
| LMArena Text: Polish | 1343 | Not measured | Only Claude Haiku 4.5 measured |
| LMArena Text: multi-turn | 1409 | 1408 | Claude Haiku 4.5 |
| LMArena Text: longer queries | 1426 | 1403 | Claude Haiku 4.5 |
| LMArena Text: writing and language | 1386 | 1381 | Claude Haiku 4.5 |
| LMArena Text: entertainment and media | 1369 | 1359 | Claude Haiku 4.5 |
| LMArena Document | 1420 | Not measured | Only Claude Haiku 4.5 measured |
| MultiChallenge | 50.5% | Not measured | Only Claude Haiku 4.5 measured |
| EQ-Bench 4 | 1053 | Not measured | Only Claude Haiku 4.5 measured |
| Neither model has a result on the other 19 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Haiku 4.5 | Inkling 2 Small | 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
Inkling 2 Small costs less
Repository review
50K input + 3K output tokens
Inkling 2 Small costs less
Agent loop
200K input + 10K output tokens
Inkling 2 Small 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.
| Specification | Anthropic Claude Haiku 4.5 | Thinking Machines Inkling 2 Small |
|---|---|---|
| Maker | Anthropic | Thinking Machines |
| Weights | No public weights listed | Open weights |
| Released | October 15, 2025 | November 9, 2026 |
| Context window | 200K | 1.05M |
| Input $/Mtok | $1.00 | $0.30 |
| Output $/Mtok | $5.00 | $1.00 |
| Coding index | 31.4 | 48.9 |
| Independent measurements behind it | 3 | 3 |
| Cost per solved task | $0.56 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Haiku 4.5 better than Inkling 2 Small for coding?
Pick Inkling 2 Small for coding: it scores 48.9 on the Vibe Coding Index against 31.4 for Claude Haiku 4.5. Pick Claude Haiku 4.5 for work measured by LMArena Text: hard prompts in English or LMArena Text: instruction following, where it leads.
Which is cheaper, Claude Haiku 4.5 or Inkling 2 Small?
Claude Haiku 4.5 costs $1.00 per million input tokens and $5.00 per million output tokens; Inkling 2 Small costs $0.30 and $1.00. Cost per solved task is known for Claude Haiku 4.5 only.
Which has the bigger context window, Claude Haiku 4.5 or Inkling 2 Small?
Inkling 2 Small, with 1.05M tokens against 200K.
How many benchmarks is the Claude Haiku 4.5 vs Inkling 2 Small comparison based on?
28 benchmarks have a result for both models as of November 14, 2026. Claude Haiku 4.5's coding index rests on 3 independent benchmarks and Inkling 2 Small's on 3. Where only one model has a result, the page says so instead of naming a winner.