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Cost per coding-agent request

Is Claude Fable 5.1 or GPT-6.1 Sol cheaper for coding agents?

For coding agents, Claude Fable 5.1 costs 3.5x as much as GPT-6.1 Sol per request ($0.24 vs $0.067 on our measured traffic), because Claude Fable 5.1 lists at $10 input, $0.25 cached input and $50 output per million tokens against $2, $0.10 and $10 for GPT-6.1 Sol, and GPT-6.1 Sol charges more for prompts over 272K tokens.

List prices: Anthropic pricing, OpenAI API pricing, checked 2026-10-13. Request costs: Standard Compute gateway data, 79,301 coding-agent requests from 75 users, Sep 13 to Oct 12, 2026. How we compute this

Run Claude Fable 5.1 in your agent from $19/month

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Cost per coding-agent request, side by side

Cost at list priceGPT-6.1 SolFable 5.1
Prompt under 100K tokens50% of requests, 87% of input cached$0.026$0.12
Prompt of 100K to 272K39% of requests, 88% of input cached$0.063$0.28
Prompt over 272K tokens11% of requests, 86% of input cached$0.28$0.63
Average request$0.067$0.24
100 requests$6.74$23.76
Median session16 requests; a session ends after 10 idle minutes$0.74$3.26
A month of regular usemedian of 20 users active on 5+ days$90.04$332

Each logged request priced at the vendor’s list rates for its own token counts, including cache reads and any higher rate for long prompts. Average output: 698 tokens per request.

Benchmarks, speed and latency, side by side

Artificial AnalysisGPT-6.1 SolFable 5.1
Intelligence Index10 evaluations, 0 to 1005253
Terminal-Bench 4.0agentic coding in a terminal56.1%52.0%
Output speedmedian65 tokens/s71 tokens/s
Time to first answer tokenincludes thinking time5.5 min4.0 min

Source: Artificial Analysis (artificialanalysis.ai). Measured variants: GPT-6.1 Sol (Max), speed on OpenAI; Claude Fable 5.1 (Max, Default Fallback), speed on Anthropic. Fetched October 13, 2026. Artificial Analysis runs Terminal-Bench 4.0 in its own setup, so its scores differ from the tbench.ai leaderboard.

What to watch for

GPT-6.1 Sol scores close to it on the benchmarks above, so the cheaper request is not bought with much lower ability.

FAQ

Is GPT-6.1 Sol cheaper than Claude Fable 5.1 for coding agents?
Yes, at list prices. 100 average coding-agent requests cost $6.74 on GPT-6.1 Sol and $23.76 on Claude Fable 5.1. A median 16-request session costs $0.74 vs $3.26. Measured on 79,301 real coding-agent requests (Sep 13 to Oct 12, 2026).
How much does a month of Fable 5.1 vs GPT-6.1 Sol cost?
For the median regular user in our data (1,478 requests in 30 days), about $332 on Claude Fable 5.1 and $90.04 on GPT-6.1 Sol at list price. Heavier users pay proportionally more.
Claude Fable 5.1 vs GPT-6.1 Sol: which is better for agents?
Claude Fable 5.1 scores higher on output quality (9.4/10 vs 9.2/10), while GPT-6.1 Sol is the cheaper option. Claude Fable 5.1 is best for teams already standardized on Fable that want the newest premium Claude; GPT-6.1 Sol is best for the default OpenAI model for coding agents, from routine changes to hard tasks. Live community votes on this page show what people actually prefer.
Can I switch between Claude Fable 5.1 and GPT-6.1 Sol in the same agent?
Yes. Model-agnostic agents (Cline, Aider, OpenClaw, Hermes Agent, Kilo Code, OpenCode, Continue) let you swap models per task. Many people route hard tasks to the stronger model and routine work to the cheaper one.

Community vote

Pick a winner in each dimension. You can change your vote any time.

Output Quality
Correctness and depth of what it produces
Agentic Ability
Tool calls, instruction-following, and multi-step tasks
Speed
Tokens per second and time-to-first-token
Value for money
How much capability you get per dollar
Reliability
Consistent results: fewer refusals, loops and format breaks

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