GPT-5 vs GPT-5.1
Why this pair: Original GPT-5 and its successor
Benchmark Performance
Available Benchmarks
| Benchmark | GPT-5 | GPT-5.1 |
|---|---|---|
| ARC-AGI-1verified-v1-b2e2a31b3d53 · verified_score · leader | 65.6790% of row best · percent · GPT-5 (High) | 72.83100% of row best · percent · GPT-5.1 (Thinking, High) |
| ARC-AGI-2verified-v2-326661568d5f · verified_score · leader | 9.8656% of row best · percent · GPT-5 (High) | 17.64100% of row best · percent · GPT-5.1 (Thinking, High) |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,132.7794% of row best · rating · gpt-5-search; 95% CI [1126.91788409, 1138.61733849]; votes 20781; rank 30 | 1,199.44100% of row best · rating · gpt-5.1-search; 95% CI [1194.20592738, 1204.68165473]; votes 59909; rank 14 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,405.9699% of row best · rating · gpt-5-high; 95% CI [1401.51371519, 1410.40173213]; votes 31418; rank 132 | 1,422.47100% of row best · rating · gpt-5.1; 95% CI [1418.85253526, 1426.08681113]; votes 43002; rank 96 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,209.1798% of row best · rating · gpt-5-high; 95% CI [1202.30024113, 1216.04249064]; votes 34389; rank 72 | 1,235.19100% of row best · rating · gpt-5.1; 95% CI [1227.44529223, 1242.93837299]; votes 10223; rank 60 |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 77.82100% of row best · points · GPT-5 · 5,896 output tokens / case | 75.9898% of row best · points · GPT-5.1 · 3,970 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above | 1 benchmark win | 5 benchmark winsOverall lead |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | GPT-5 | GPT-5.1 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Family | Gpt 5 | Gpt 5 1 |
| Model | GPT-5 | GPT-5.1 |
| Version | GPT-5 | GPT-5.1 |
| Lifecycle | active | active |
| Released | 2025-08-07 | 2025-11-13 |
| Knowledge cutoff | 2024-09-30 | 2024-09-30 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 400,000 | 400,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Openai (Standard), Openrouter (Standard) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
15 comparable fields · 4 material differences · Editorially curated pair passes the primary-source comparison gate
GPT-5 Capabilities
GPT-5.1 Capabilities
Internal Comparison Graph
Related Comparisons
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|---|---|---|---|
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Primary Evidence
Sources and Freshness
Questions
GPT-5 vs GPT-5.1 FAQs
Is GPT-5 or GPT-5.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5 and GPT-5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5 or GPT-5.1?+
GPT-5 is $0.625 and GPT-5.1 is $1.25 per million tokens, so GPT-5 is cheaper on this metric. GPT-5 is $5.00 and GPT-5.1 is $10.00 per million tokens, so GPT-5 is cheaper on this metric.
Which has a larger context window, GPT-5 or GPT-5.1?+
Neither model has a larger sourced context window in this comparison. GPT-5 is 400,000 and GPT-5.1 is 400,000.
Which performs better in benchmarks, GPT-5 or GPT-5.1?+
GPT-5.1 leads the current overall benchmark count. The result uses 6 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can GPT-5 or GPT-5.1 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5 is not marked open weight; GPT-5.1 is not marked open weight.
Can GPT-5 and GPT-5.1 understand images?+
GPT-5 is documented with image input; GPT-5.1 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5 or GPT-5.1?+
Neither has a larger sourced maximum output. GPT-5 is 128,000 and GPT-5.1 is 128,000.
Do GPT-5 and GPT-5.1 support reasoning and tool use?+
GPT-5: reasoning, tool calling, and image input. GPT-5.1: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5 or GPT-5.1?+
GPT-5 has 2 sourced provider routes; GPT-5.1 has 2, a tie.
Which offers better value, GPT-5 or GPT-5.1?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.