Model comparison
GPT-5.1 vs Inkling
Head-to-head evidence from 14 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Verified leaderboard positions: GPT-5.1 unranked; Inkling #17
BenchAlign evidence: GPT-5.1 supported; Inkling not scored. Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.1 and Inkling share 14 comparable benchmark results. 1 of 8 categories are comparable. 8 results are unique to GPT-5.1; 18 to Inkling.
Updated July 16, 2026- Shared results
- 14
- GPT-5.1 only
- 8
- Inkling only
- 18
- Comparable categories
- 1 / 8
Pick Inkling if you want the stronger benchmark profile. GPT-5.1 only becomes the better choice if you want the stronger reasoning-first profile.
Confidence note. This is a partial-evidence comparison with 14 shared benchmark results across 5 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Inkling finishes one point ahead on BenchLM's provisional leaderboard, 72 to 71. That is enough to call, but not enough to treat as a blowout. This matchup comes down to a few meaningful edges rather than one model dominating the board.
Inkling's sharpest advantage is in mathematics, where it averages 97.1 against 26.4.
GPT-5.1 is also the more expensive model on tokens at $1.25 input / $10.00 output per 1M tokens, versus $1.87 input / $4.68 output per 1M tokens for Inkling. That is roughly 2.1x on output cost alone. GPT-5.1 is the reasoning model in the pair, while Inkling is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Inkling gives you the larger context window at 1M, compared with 200K for GPT-5.1.
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 | GPT-5.1 | Δ | Inkling |
|---|---|---|---|
| Math | GPT-5.126.4 | Margin→ 70.7 | Inkling97.1 |
| Agentic | GPT-5.1Not measured | MarginNo overlap | Inkling69.4 |
| Coding | GPT-5.1Not measured | MarginNo overlap | Inkling68.6 |
| Knowledge | GPT-5.1Not measured | MarginNo overlap | Inkling51.7 |
| Multimodal | GPT-5.1Not measured | MarginNo overlap | Inkling76.5 |
| Inst. Following | GPT-5.1Not measured | MarginNo overlap | Inkling79.8 |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.1 | Inkling | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.1$1.25 input / $10 output | Inkling$1.87 input / $4.68 output | Inkling has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.1111 tok/s | InklingNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.157.47 s | InklingNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.1200K | Inkling1M | Inkling lists the larger context window. |
Benchmark Deep Dive
Agentic11 benchmarks
| Benchmark | GPT-5.1 | Inkling | Result |
|---|---|---|---|
| AA Agentic IndexSource | 21.0% | 32.3% | Inkling leads |
| τ²-bench resultsSource | 81.9% | — | Not comparable |
| Gert LabsSource | 41.24% | — | Not comparable |
| GDPval-AASource | 24.4% | 36.9% | Inkling leads |
| GDPval-AASource | 987 | 1239 | Inkling leads |
| Terminal-Bench 2.0Source | — | 63.8% | Not comparable |
| BrowseCompSource | — | 77.1% | Not comparable |
| MCP AtlasSource | — | 74.1% | Not comparable |
| Design Arena Agentic Web DevSource | — | 1258 | Not comparable |
| AA BriefcaseSource | — | 836 | Not comparable |
| AA Tau3 BankingSource | — | 23.7% | Not comparable |
Coding7 benchmarks
| Benchmark | GPT-5.1 | Inkling | Result |
|---|---|---|---|
| Vibe Code BenchSource | 24.61% | — | Not comparable |
| AA Coding IndexSource | 49.4% | 52.1% | Inkling leads |
| Terminal-Bench HardSource | 45.5% | — | Not comparable |
| AA-SciCodeSource | 43.3% | 46.1% | Inkling leads |
| SWE-bench VerifiedSource | — | 77.6% | Not comparable |
| SWE-bench ProSource | — | 54.3% | Not comparable |
| Terminal-Bench 2.0Source | — | 63.8% | Not comparable |
Reasoning2 benchmarks
Knowledge10 benchmarks
| Benchmark | GPT-5.1 | Inkling | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 36.9% | 40.7% | Inkling leads |
| AA-GPQA DiamondSource | 87.3% | 87.2% | GPT-5.1 leads |
| AA-HLESource | 26.5% | 29.7% | Inkling leads |
| AA-Omniscience IndexSource | 5.6% | 2.1% | GPT-5.1 leads |
| AA-Omniscience AccuracySource | 37.6% | 40.0% | Inkling leads |
| AA-Omniscience Hallucination RateSource | 51.3% | 63.1% | GPT-5.1 leads |
| GPQASource | — | 87.9% | Not comparable |
| GPQA-DSource | — | 87.9% | Not comparable |
| HLESource | — | 46% | Not comparable |
| HLE w/o toolsSource | — | 30% | Not comparable |
MathInkling wins3 benchmarks
Multimodal5 benchmarks
Frequently Asked Questions (2)
Which is better, GPT-5.1 or Inkling?
Inkling is ahead on BenchLM's provisional leaderboard, 72 to 71.
Which is better for math, GPT-5.1 or Inkling?
Inkling has the edge for math in this comparison, averaging 97.1 versus 26.4. GPT-5.1 stays close enough that the answer can still flip depending on your workload.
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