Model comparison
Claude 4.1 Opus vs GPT-5.1-Codex-Max
Head-to-head evidence from 1 shared benchmark result across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude 4.1 Opus #142 (Supported); GPT-5.1-Codex-Max #90 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude 4.1 Opus and GPT-5.1-Codex-Max share 1 comparable benchmark result. 0 of 8 categories are comparable. 3 results are unique to Claude 4.1 Opus; 12 to GPT-5.1-Codex-Max.
Updated July 20, 2026- Shared results
- 1
- Claude 4.1 Opus only
- 3
- GPT-5.1-Codex-Max only
- 12
- Comparable categories
- 0 / 8
Benchmark data for Claude 4.1 Opus and GPT-5.1-Codex-Max is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 1 shared benchmark result across 1 evidence category; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
Claude 4.1 Opus is priced at $15.00 input / $75.00 output per 1M tokens, versus $1.25 input / $10.00 output per 1M tokens for GPT-5.1-Codex-Max. GPT-5.1-Codex-Max has the larger context window at 400K, compared with 200K for Claude 4.1 Opus.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude 4.1 Opus | Δ | GPT-5.1-Codex-Max |
|---|---|---|---|
| Coding | Claude 4.1 Opus74.5 | MarginNo overlap | GPT-5.1-Codex-MaxNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude 4.1 Opus | GPT-5.1-Codex-Max | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude 4.1 Opus$15 input / $75 output | GPT-5.1-Codex-Max$1.25 input / $10 output | GPT-5.1-Codex-Max has the lower combined listed price. |
| Generation speedtokens per second | Claude 4.1 Opus29 tok/s | GPT-5.1-Codex-MaxNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude 4.1 Opus1.66 s | GPT-5.1-Codex-MaxNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude 4.1 Opus200K | GPT-5.1-Codex-Max400K | GPT-5.1-Codex-Max lists the larger context window. |
Benchmark Deep Dive
Agentic2 benchmarks
Coding3 benchmarks
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Claude 4.1 Opus | GPT-5.1-Codex-Max | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 28.2% | 34.7% | GPT-5.1-Codex-Max leads |
| AA-GPQA DiamondSource | — | 86.0% | Not comparable |
| AA-HLESource | — | 23.4% | Not comparable |
| AA-Omniscience IndexSource | — | -6.0% | Not comparable |
| AA-Omniscience AccuracySource | — | 39.2% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 74.4% | Not comparable |
Multimodal2 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude 4.1 Opus | GPT-5.1-Codex-Max | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 70.0% | Not comparable |
Frequently Asked Questions (3)
Can I compare Claude 4.1 Opus and GPT-5.1-Codex-Max on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for Claude 4.1 Opus and GPT-5.1-Codex-Max today?
Claude 4.1 Opus: $15.00 input / $75.00 output per 1M tokens GPT-5.1-Codex-Max: $1.25 input / $10.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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