Cheaper overall
GPT-6.1 Sol
60% lower blended rate
Higher benchmark scores
GPT-6.1 Sol
leads on 5 of 8 figures
Bigger context window
GPT-6.1 Sol
1,050,000 vs 1,000,000 tokens
Cheaper cached input
GPT-6.1 Sol
$0.10 vs $0.50, 80% less
Where each one wins
GPT-6.1 Sol
- Cheaper input tokens $2.00 vs $5.00, 60% less
- Cheaper output tokens $10.00 vs $25.00, 60% less
- Cheaper cached input $0.10 vs $0.50, 80% less
- Cheaper on all four workloads
- Larger context window 1,050,000 tokens
- Higher overall intelligence (Intelligence Index) 51.8 vs 50.8
- Higher long-context reasoning (AA-LCR) 83 vs 82
- Higher physics research reasoning (CritPt) 31.7 vs 29.1
- Ahead on 2 more benchmark figures
- Offers Flex and Priority pricing not listed for Claude Opus 5
Claude Opus 5
- Higher expert-exam performance (Humanity's Last Exam) 54.9 vs 52.9
- Higher scientific coding (SciCode) 56.4 vs 54.2
- Higher real-world task performance (GDPval) 60.4 vs 53.8
What four workloads cost
One run, and the same run a thousand times.
Caching is what decides it: over twenty calls GPT-6.1 Sol costs $0.2800 against $0.8500, a difference of $570.00 across a thousand loops.
| Workload | GPT-6.1 Sol | Claude Opus 5 | ×1,000 | Difference |
|---|---|---|---|---|
| Chat turn 1,000 in / 500 out | $0.0070 | $0.0175 | $7.00 / $17.50 | GPT-6.1 Sol is 60% cheaper |
| RAG answer 10,000 in / 800 out | $0.0280 | $0.0700 | $28.00 / $70.00 | GPT-6.1 Sol is 60% cheaper |
| Agent loop 32,000 in / 700 out × 20 calls | $0.2800 | $0.8500 | $280.00 / $850.00 | GPT-6.1 Sol is 67% cheaper |
| Long document 400,000 in / 3,000 out | $1.65 | $2.08 | $1,645.00 / $2,075.00 | GPT-6.1 Sol is 21% cheaper |
Price per 1M tokens
Above 272,000 input tokens the rates change, and the new rate applies to the whole request, not just the tokens past that point: GPT-6.1 Sol's input goes from $2.00 to $4.00. It does not change which of the two is cheaper.
| Context band | Price | GPT-6.1 Sol | Claude Opus 5 | Difference |
|---|---|---|---|---|
| Prompts up to 272,000 tokens | Input | $2.00 | $5.00 | GPT-6.1 Sol is 60% cheaper |
| Prompts up to 272,000 tokens | Cached input | $0.10 | $0.50 | GPT-6.1 Sol is 80% cheaper |
| Prompts up to 272,000 tokens | Output | $10.00 | $25.00 | GPT-6.1 Sol is 60% cheaper |
| Prompts over 272,000 tokens | Input | $4.00 | $5.00 | GPT-6.1 Sol is 20% cheaper |
| Prompts over 272,000 tokens | Cached input | $0.20 | $0.50 | GPT-6.1 Sol is 60% cheaper |
| Prompts over 272,000 tokens | Output | $15.00 | $25.00 | GPT-6.1 Sol is 40% cheaper |
Blended: GPT-6.1 Sol $4.00, Claude Opus 5 $10.00 per 1M — one rate at 3:1 input to output, for comparing two models at a glance.
GPT-6.1 Sol priced by OpenAI, Claude Opus 5 by Anthropic. Standard tier, pay-as-you-go.
Other pricing tiers
Both models offer Batch, worth up to 50% off their standard rates, and the cheaper model is the same one on every tier — so the tier you buy changes the bill rather than the choice. Only GPT-6.1 Sol lists Flex and Priority, at up to 50% off its own standard rate; Claude Opus 5 offers none of them.
Every tier either model sells is here, so this is the whole price sheet. A saving is measured against that model's own standard rate — how we read tiers.
| Tier | GPT-6.1 Sol | Claude Opus 5 | Cheaper |
|---|---|---|---|
| Batch | $1.00 in / $5.00 out 50% off Standard | $2.50 in / $12.50 out 50% off Standard | GPT-6.1 Sol |
| Flex only on GPT-6.1 Sol | $1.00 in / $5.00 out 50% off Standard | Not offered | — |
| Priority only on GPT-6.1 Sol | $4.00 in / $20.00 out | Not offered | — |
Benchmarks
They share 8 figures: GPT-6.1 Sol leads on 5, Claude Opus 5 on 3. The widest gap is 6.6 points, on real-world task performance (GDPval).
Overall intelligence
Intelligence Index — Overall intelligence across reasoning, knowledge & math evals
GPT-6.1 Sol ahead by 1
Expert-exam performance
Humanity's Last Exam — Expert-level questions across many academic domains
Claude Opus 5 ahead by 2
Long-context reasoning
AA-LCR — Long-context reasoning across large inputs
GPT-6.1 Sol ahead by 1
Scientific coding
SciCode — Research-level scientific coding tasks
Claude Opus 5 ahead by 2.2
Physics research reasoning
CritPt — Unpublished physics research reasoning problems
GPT-6.1 Sol ahead by 2.6
Real-world task performance
GDPval — Economically valuable, real-world knowledge work
Claude Opus 5 ahead by 6.6
Factual accuracy
Omniscience Accuracy — Breadth of factual knowledge across domains
GPT-6.1 Sol ahead by 1.2
Answer reliability
Omniscience Non-Hallucination — How reliably the model avoids fabricated answers
GPT-6.1 Sol ahead by 5.2
Each figure is that model's best published run, with the effort level named beside it — where these scores come from.
Specifications
GPT-6.1 Sol holds 50,000 more input tokens in one request. Only GPT-6.1 Sol lists web search.
| Specification | GPT-6.1 Sol | Claude Opus 5 |
|---|---|---|
| Context window | 1,050,000 tokens | 1,000,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Takes in | Text, image, file | Text, image, file |
| Puts out | Text | Text |
| Knowledge cutoff | 30 Apr 2026 | — |
| Released | 29 Sep 2026 | 24 Jul 2026 |
| Status | Active | Active |
| Sold by | OpenAI, Perplexity | Anthropic, Perplexity |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Web search | Yes | Not listed |
| Prompt caching | Yes | Yes |
| Code execution | Yes | Yes |
| Computer use | Yes | Yes |
| Open weights | Not listed | Not listed |
| Reasoning | Yes | Yes |
FAQs
- Is GPT-6.1 Sol cheaper than Claude Opus 5?
- Yes. A 1,000-token prompt with a 500-token reply costs $0.0070 on GPT-6.1 Sol and $0.0175 on Claude Opus 5, and the same model is cheaper on every workload on this page.
- How much do GPT-6.1 Sol and Claude Opus 5 cost per 1M tokens?
- GPT-6.1 Sol costs $2.00 for input and $10.00 for output. Claude Opus 5 costs $5.00 and $25.00. Standard pay-as-you-go rates, as of 29 Sep 2026.
- Which is better, GPT-6.1 Sol or Claude Opus 5?
- On published benchmarks, GPT-6.1 Sol. It leads on 5 of the 8 figures both models report, including overall intelligence (Intelligence Index), where it scores 51.8 against 50.8.
- Is Batch pricing cheaper for GPT-6.1 Sol or Claude Opus 5?
- Batch input costs $1.00 on GPT-6.1 Sol and $2.50 on Claude Opus 5, 50% below the standard rate on both.
- Does GPT-6.1 Sol or Claude Opus 5 have a bigger context window?
- GPT-6.1 Sol, at 1,050,000 tokens against 1,000,000. That is 50,000 more input tokens in a single request.