GPT-5.4 Pro vs Pareto 26.9
Pareto 26.9 costs 24.0x less per output token than GPT-5.4 Pro ($7.50 vs $180.00 per million). Updated October 23, 2026; no benchmark has tested both models yet.
- Coding
- No data
- Overall
- No data
- Output $/M
- $180.00
- Coding
- No data
- Overall
- No data
- Output $/M
- $7.50
GPT-5.4 Pro or Pareto 26.9: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick GPT-5.4 Pro for a larger context window (1.05M against 262K tokens).
No benchmark has tested both yet. GPT-5.4 Pro has results on WeirdML, Epoch Capabilities Index and GPQA Diamond (Epoch AI run); Pareto 26.9 has none yet. Compare them on price and context instead.
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
No call
Neither has a coding score yet.
One side not measured
Long documents
Listed context window
GPT-5.4 Pro
GPT-5.4 Pro takes 1.05M tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Pareto 26.9
GPT-5.4 Pro $0.120, Pareto 26.9 $0.0063 per turn.
List prices
At a glance
- Coding index
- GPT-5.4 Pro not benchmarked, Pareto 26.9 not benchmarked.
- Widest category
- None yet: no category has been tested on both models.
- Widest single gap
- None yet: no benchmark has tested both models.
- Output price
- GPT-5.4 Pro $180.00 against Pareto 26.9 $7.50 per million output tokens, 24.0x apart.
- Context window
- GPT-5.4 Pro takes 1.05M tokens, Pareto 26.9 262K.
Benchmark by benchmark
Every board either model has a result on, a category to a fold; bars are each result on a 0 to 100 scale. Only one model is measured on each, so no row names a leader.
CodingDirectional onlySix of these boards feed the Vibe Coding Index1 board measured
| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Leader |
|---|---|---|---|
| WeirdML | 57.4% | Not measured | Only GPT-5.4 Pro measured |
| Neither model has a result on the other 42 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Leader |
|---|---|---|---|
| Epoch Capabilities Index | 159.6 | Not measured | Only GPT-5.4 Pro measured |
| Neither model has a result on the other 1 board here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index5 boards measured
| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Leader |
|---|---|---|---|
| GPQA Diamond (Epoch AI run) | 94.6% | Not measured | Only GPT-5.4 Pro measured |
| ARC-AGI | 94.5% | Not measured | Only GPT-5.4 Pro measured |
| ARC-AGI-2 | 83.3% | Not measured | Only GPT-5.4 Pro measured |
| SimpleBench | 74.1% | Not measured | Only GPT-5.4 Pro measured |
| Chess puzzles | 59.0% | Not measured | Only GPT-5.4 Pro measured |
| Neither model has a result on the other 18 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index3 boards measured
| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Leader |
|---|---|---|---|
| FrontierMath, tiers 1 to 3 | 82.5% | Not measured | Only GPT-5.4 Pro measured |
| FrontierMath, tier 4 | 58.5% | Not measured | Only GPT-5.4 Pro measured |
| MathArena | 52.5% | Not measured | Only GPT-5.4 Pro measured |
| Neither model has a result on the other 11 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Leader |
|---|---|---|---|
| SimpleQA Verified | 46.3% | Not measured | Only GPT-5.4 Pro measured |
| Neither model has a result on the other 19 boards here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index1 board measured
| Benchmark | GPT-5.4 Pro | Pareto 26.9 | Leader |
|---|---|---|---|
| MultiChallenge | 69.2% | Not measured | Only GPT-5.4 Pro measured |
| Neither model has a result on the other 47 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
Pareto 26.9 costs less
Repository review
50K input + 3K output tokens
Pareto 26.9 costs less
Agent loop
200K input + 10K output tokens
Pareto 26.9 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 | OpenAI GPT-5.4 Pro | Pareto 26.9 |
|---|---|---|
| Maker | OpenAI | Unbiased |
| Weights | No public weights listed | No public weights listed |
| Released | March 5, 2026 | October 13, 2026 |
| Context window | 1.05M | 262K |
| Input $/Mtok | $30.00 | $2.50 |
| Output $/Mtok | $180.00 | $7.50 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-5.4 Pro better than Pareto 26.9 for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-5.4 Pro for a larger context window (1.05M against 262K tokens).
Which is cheaper, GPT-5.4 Pro or Pareto 26.9?
GPT-5.4 Pro costs $30.00 per million input tokens and $180.00 per million output tokens; Pareto 26.9 costs $2.50 and $7.50. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-5.4 Pro or Pareto 26.9?
GPT-5.4 Pro, with 1.05M tokens against 262K.
Has any benchmark tested both GPT-5.4 Pro and Pareto 26.9?
No benchmark has tested both yet. GPT-5.4 Pro has results on WeirdML, Epoch Capabilities Index and GPQA Diamond (Epoch AI run); Pareto 26.9 has none yet. Compare them on price and context instead. Data as of October 23, 2026.