GPT-5.5 vs Claude Sonnet 5
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| Comparison | GPT-5.5gpt-5.5 | Claude Sonnet 5claude-sonnet-5 |
|---|---|---|
| Type | Chat | Chat |
| Best for | Chat, writing, coding and reasoning tasks | Chat, writing, coding and reasoning tasks |
| TokenRex price | $5.00 in / $30.00 out per 1M tokens | $2.00 in / $10.00 out per 1M tokens |
| Cached input / 1M tokens | $0.50 per 1M tokens | $0.20 per 1M tokens |
| Cache write / 1M tokens | No extra fee | $2.50 per 1M tokens |
| Cached output | Not offered · standard output rate applies | Not offered · standard output rate applies |
| Market price | $5.00 in / $30.00 out per 1M tokens | $2.00 in / $10.00 out per 1M tokens |
| Context window (provider) | 1,050,000 tokens | 1,000,000 tokens |
| Input token limit (provider) | Within the context window | Within the context window |
| Maximum output | 128,000 tokens | 128,000 tokens |
| Knowledge cutoff | Dec 01, 2025 | Jan 2026 |
| Vendor input modalities | Not verified | Text, Image |
| Vendor output modalities | Not verified | Text |
| TokenRex endpoints | POST /v1/chat/completions | POST /v1/chat/completions · POST /v1/messages |
| TokenRex input | Text, Image/PDF content through the chat bridge | Text, Image/PDF content through the chat bridge |
| TokenRex output | Text | Text |
| Benchmarks | ||
| Benchmark evidence | 2 source-linked results | 4 source-linked results |
| FrontierCode v1.1 (Extended) | 51.37% Cognition FrontierCode 1.1; GPT-5.5; medium effort; codex harness; Extended subset (150 tasks). Published weighted rubric score (new_score × 100), not the all-or-nothing pass rate; solution-source violations score zero. Source field new_score=0.5137. Publisher evaluation, not a TokenRex measurement; provider effort configuration is not a guarantee of the API's fixed thinking budget. Cognition · FrontierCode 1.1 original leaderboard | 49.28% Cognition FrontierCode 1.1; Claude Sonnet 5; medium effort; claude-code harness; Extended subset (150 tasks). Published weighted rubric score (new_score × 100), not the all-or-nothing pass rate; solution-source violations score zero. Source field new_score=0.4928. Publisher evaluation, not a TokenRex measurement; provider effort configuration is not a guarantee of the API's fixed thinking budget. Cognition · FrontierCode 1.1 original leaderboard |
| FrontierCode v1.1 (Main) | 36.6% Cognition FrontierCode 1.1; GPT-5.5; medium effort; codex harness; Main subset (100 tasks). Published weighted rubric score (new_score × 100), not the all-or-nothing pass rate; solution-source violations score zero. Source field new_score=0.366. Publisher evaluation, not a TokenRex measurement; provider effort configuration is not a guarantee of the API's fixed thinking budget. Cognition · FrontierCode 1.1 original leaderboard | 35.2% Cognition FrontierCode 1.1; Claude Sonnet 5; medium effort; claude-code harness; Main subset (100 tasks). Published weighted rubric score (new_score × 100), not the all-or-nothing pass rate; solution-source violations score zero. Source field new_score=0.352. Publisher evaluation, not a TokenRex measurement; provider effort configuration is not a guarantee of the API's fixed thinking budget. Cognition · FrontierCode 1.1 original leaderboard |
| GMMLU | — | 89% Fable 5.1 system card section 8.18 comparison table: adaptive thinking max effort, single trial, no tools or custom system prompts. Published comparison, not catalog medium effort. Anthropic Fable 5.1 system card · sections 8.1–8.11 |
| MILU | — | 89.3% Fable 5.1 system card section 8.18 comparison table: adaptive thinking max effort, single trial, no tools or custom system prompts. Published comparison, not catalog medium effort. Anthropic Fable 5.1 system card · sections 8.1–8.11 |
No overall score, winner or cost-versus-score frontier is calculated without comparable, attributable benchmark evidence. Different test configurations appear separately. Vendor capabilities are distinct from TokenRex API support.
— means no published value or no matching capability. Provider token limits are not tested gateway guarantees; TokenRex media controls and response formats are listed separately.
GPT-5.5
Sources and verification
Provider specifications describe the upstream model, not a guarantee of every feature through TokenRex. Prices come from the enabled catalog; benchmark results belong to the exact tested model.
- Provider model specifications
Vendor-reported
Last checked - Cognition · FrontierCode 1.1 original leaderboard
Third-party report
Last checked
Research notes (1)
- Published provider limits; maximum-capacity requests have not been independently exercised through TokenRex. Thinking-level variants use the same provider model; reasoning and answer tokens share the output budget.
Claude Sonnet 5
Sources and verification
Provider specifications describe the upstream model, not a guarantee of every feature through TokenRex. Prices come from the enabled catalog; benchmark results belong to the exact tested model.
- Provider model specifications
Vendor-reported
Last checked - Anthropic Fable 5.1 system card · sections 8.1–8.11
Vendor-reported
Last checked - Cognition · FrontierCode 1.1 original leaderboard
Third-party report
Last checked
Research notes (1)
- Published provider limits; maximum-capacity requests have not been independently exercised through TokenRex. Thinking-level variants use the same provider model; reasoning and answer tokens share the output budget.
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