GPT-5.1 vs GPT-5.2
Why this pair: Consecutive OpenAI flagship generations
Benchmark Performance
Available Benchmarks
| Benchmark | GPT-5.1 | GPT-5.2 |
|---|---|---|
| ARC-AGI-1verified-v1-15fb467fd4fc · verified_score · leader | 72.8385% of row best · percent · GPT-5.1 (Thinking, High) | 86.17100% of row best · percent · GPT-5.2 (XHigh) |
| ARC-AGI-2verified-v2-9a3db289984e · verified_score · leader | 17.6433% of row best · percent · GPT-5.1 (Thinking, High) | 52.91100% of row best · percent · GPT-5.2 (XHigh) |
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · statistical tie | 1,400.84100% of row best · rating · gpt-5.1; 95% CI [1391.40144375, 1410.27736947]; votes 8220; rank 37 | 1,400.07100% of row best · rating · gpt-5.2; 95% CI [1394.12737338, 1406.01746377]; votes 28068; rank 38 |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,199.44100% of row best · rating · gpt-5.1-search; 95% CI [1194.20592738, 1204.68165473]; votes 59909; rank 14 | 1,172.1498% of row best · rating · gpt-5.2-search-non-reasoning; 95% CI [1166.59081201, 1177.68538907]; votes 75658; rank 20 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,422.47100% of row best · rating · gpt-5.1; 95% CI [1418.85253526, 1426.08681113]; votes 43002; rank 96 | 1,412.4299% of row best · rating · gpt-5.2; 95% CI [1409.19172501, 1415.64592175]; votes 79073; rank 122 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · statistical tie | 1,235.19100% of row best · rating · gpt-5.1; 95% CI [1227.44529223, 1242.93837299]; votes 10223; rank 60 | 1,229.36100% of row best · rating · gpt-5.2; 95% CI [1223.13578833, 1235.59275214]; votes 19024; rank 63 |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 75.9897% of row best · points · GPT-5.1 · 3,970 output tokens / case | 78.08100% of row best · points · GPT-5.2 · 4,266 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 2 ties | 2 benchmark wins | 3 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-5.1 | GPT-5.2 |
|---|---|---|
| Developer | Openai | Openai |
| Family | Gpt 5 1 | Gpt 5 2 |
| Model | GPT-5.1 | GPT-5.2 |
| Version | GPT-5.1 | GPT-5.2 |
| Lifecycle | active | active |
| Released | 2025-11-13 | 2025-12-11 |
| Knowledge cutoff | 2024-09-30 | 2025-08-31 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| 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 |
13 comparable fields · 5 material differences · Interactive comparison only; indexing gate not met
GPT-5.1 Capabilities
GPT-5.2 Capabilities
Internal Comparison Graph
Related Comparisons
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|---|---|---|---|
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Primary Evidence
Sources and Freshness
Questions
GPT-5.1 vs GPT-5.2 FAQs
Is GPT-5.1 or GPT-5.2 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both GPT-5.1 and GPT-5.2, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, GPT-5.1 or GPT-5.2?+
GPT-5.1 is $1.25 and GPT-5.2 is $1.75 per million tokens, so GPT-5.1 is cheaper on this metric. GPT-5.1 is $10.00 and GPT-5.2 is $14.00 per million tokens, so GPT-5.1 is cheaper on this metric.
Which has a larger context window, GPT-5.1 or GPT-5.2?+
Neither model has a larger sourced context window in this comparison. GPT-5.1 is 400,000 and GPT-5.2 is 400,000.
Which performs better in benchmarks, GPT-5.1 or GPT-5.2?+
GPT-5.2 leads the current overall benchmark count. The result uses 7 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can GPT-5.1 or GPT-5.2 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. GPT-5.1 is not marked open weight; GPT-5.2 is not marked open weight.
Can GPT-5.1 and GPT-5.2 understand images?+
GPT-5.1 is not documented with image input; GPT-5.2 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, GPT-5.1 or GPT-5.2?+
Neither has a larger sourced maximum output. GPT-5.1 is 128,000 and GPT-5.2 is 128,000.
Do GPT-5.1 and GPT-5.2 support reasoning and tool use?+
GPT-5.1: reasoning and tool calling. GPT-5.2: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, GPT-5.1 or GPT-5.2?+
GPT-5.1 has 2 sourced provider routes; GPT-5.2 has 2, a tie.
Which offers better value, GPT-5.1 or GPT-5.2?+
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.