GPT-6.1 Sol
Last verified October 15, 2026 · OpenAI pricing ↗$2.00/1M input · $10.00/1M output · 1.1M context · OpenAI
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Pricing Details
OpenAI12H CACHE (2026-10-20): Responses API prompt_cache_options.ttl "12h" bills cache writes at 2.5x input, $5.00 per 1M (the default "30m" stays 1.25x); reads unchanged. Launched September 29, 2026 at DevDay, one week after GPT-6 Sol. Card: $2.00 input, $0.10 cached input, $2.50 cache write, $10.00 output. The ONLY change from GPT-6 Sol is cached input, $0.20 to $0.10 (cache discount 90% to 95% off); every other multiplier is unchanged so the halving carries through all tiers. Batch and Flex 50%: $1.00 / $0.05 / $1.25 / $5.00. Fast 2x: $4.00 / $0.20 / $5.00 / $20.00. LONG CONTEXT: over 272,000 input tokens the whole request bills $4.00 / $0.20 / $5.00 / $15.00 (Batch/Flex $2.00 / $0.10 / $2.50 / $7.50, Fast $8.00 / $0.40 / $10.00 / $30.00). ULTRAFAST (service_tier 'ultrafast', live October 8, 2026 in the API, Codex and ChatGPT Work, all API users): exactly 6x Standard on every line, $12.00 input / $0.60 cached / $15.00 cache write / $60.00 output; over 272K input $24.00 / $1.20 / $30.00 / $90.00. That is 1.2x GPT-6 Astra Standard on input, cache write and output (OpenAI's own '1.2x the cost of Astra'). OpenAI claims 'up to 8x faster' than Standard and publishes no tokens/sec. Artificial Analysis (max effort, read 2026-10-15): Ultrafast 318.2 t/s and $4.35 per index task, Fast 98.2 t/s / $1.45, Flex 74.5 t/s / $0.36, Standard 48.7 t/s / $0.72, so Ultrafast is about 6.5x Standard's speed for 6x the price. Own TPM limits: Build 1M, Launch 4M, Grow 40M. US and EU residency supported. Codex: Pro $500 and eligible Enterprise/Edu only, included usage at 8x, credits at 6x. Astra Ultrafast is 6x Astra's own Standard ($60/$6/$75/$300), US only. Regional processing and FedRAMP +10%; Fast unavailable with EU residency. Context 1,050,000 (922,000 max input + 128,000 max output). Knowledge cutoff April 30, 2026. Reasoning effort low / medium (default) / high / xhigh / max; 'none' and 'minimal' are NOT supported, unlike GPT-6 Sol and Luna, so migrations setting none must switch to low. Tool calling Responses API only. Same input, cache write and output as Claude Sonnet 5.5 ($2 / $2.50 / $10); cache read matches Sonnet 5.5's $0.10 (corrected 2026-10-13), but Sonnet 5.5 has no long-context surcharge. Artificial Analysis Intelligence Index v4.3.2 (read 2026-09-30): max 52 at $0.72 per task (67M output tokens across the index), medium 48 at $0.21 per task (15M); GPT-6 Sol max 48 at $1.05 (77M), Astra max 53 at $3.26, Sonnet 5.5 max 56 at $7.60, Opus 5.5 max 58 at $5.98. Vals Index (max): 61.15% at $3.237 per test, rank 7 of 30 (GPT-6 Sol 57.54% at $7.581). OpenAI-reported via press (launch post not directly readable): DeepSWE v1.1 about level with Astra at about 1/5 the cost per task; OSWorld 2.0 within 2.1 points of Astra at about 1/7; AutomationBench 2.2 points above Opus 5.5 at about 1/3 the cost (Vellum: 35.4 at medium; Sonnet 5.5 scores 44.7); Terminal-Bench Science 0.1 at max $5.47 per task vs Opus 5.5 $23.21 and Astra $23.80. AVAILABILITY: ChatGPT Work and Codex (Codex default model); Azure Foundry GA 2026-09-29 at list in Global, +10% US Data Zone, +20% EU and APAC ($2.40 / $0.12 / $3.00 / $12.00); Amazon Bedrock GA 2026-09-29, AWS prints no rate, LiteLLM carries Global at list and US in-region at 1.1x. Model ID: gpt-6.1-sol.
Input / 1M tokens
$2
Output / 1M tokens
$10
Context Window
1.1M
Max Output
128K
Price History
Launched at current price on 2026-09-29. No price changes recorded since.
Frequently Asked Questions
Common questions about GPT-6.1 Sol pricing and usage
Read More About GPT-6.1 Sol
OpenAI's 12-hour prompt cache costs twice as much to write as the 30-minute default. It pays for itself on the third visit, and switched on everywhere it makes a busy agent loop 39% dearer.
October 26, 2026 · 7 min read
Kimi K3.1 Pro joins Sonnet 5.5, GPT-6.1 Sol and Gemini 4 Argon at $2 in and $10 out. Its cache hits cost double, and it spends 2.2x Sol's tokens per task, so the matching price tag hides a 3x spread.
October 24, 2026 · 7 min read
Gemini 4 Argon is out of preview, and its $2 price now has an end date: November 30. Until then it is the cheapest frontier model for prompts over 272K tokens. On December 1 it costs what Claude Opus 5.5 costs.
October 20, 2026 · 6 min read